Dynamo-electric machine.



DYNAMO ELECTRIC MACHINE.

APPLICATION FILED 1.111,9, 1912.

Patented Sept. 16,1913. E

UNITED SIAIESUM OFFICE.

GABRIEL WINTEE, ,DEoEAsEn BY erro WOLERUM, ADMIRIsIRAToR, or VIENNA,@SERIA-HUNGARY, AND ERIEIJE-IGII EICIIE'ERG, 0E BERLIN, GERMANY; sA-InWINTERAND SAID EICIIEER@ AssIeNoIlts ToeENEEAL ELECTRIC COMPANY, A

CORPORATION O NEW YORK.

DYNAMO-ELECTRIC MACHINE.

1,073,201.- onginsi applieatibn inea June 11, wb2, serial Specicatin ofLetters Patent.

1912. serial No: 670,161.-

.useful Improvements in Dynamo-Electric Machines, of which the followingis a speciiication.

This application is a ydivision of application Serial No. 111,180, tiledJune 11, 1902,

by the said Gabriel Winter and Friedrich.

Eichberg and which has resulted in United States Letters Patent No.1,016,866 of February 0, 1912. In that former application, there isdescribed an alternating-current motor of the commutator type in whichthe two members of the motor are rovidcd with primary and secondary winings, respectively, arranged to produce a single magnetization along afixed line constituting the working axis, means for supplying to thewindings voltages ot relatively varying magnitudes, and means formagnetizing the motor in a second direction at an angle to the first. Asdescribed in that application, the means for producing the secondmagnetization of the motor, comprises a magnetizing winding on eitherstator or rotor, which may be separate. trom the other two windings, orcombined with either the primary or the secondary winding. Asdisclosedin that application the means for'prodlicing' the second magnetizationof the motor took in some cases the forni of a magy,

netizing winding on the rotor, either separate from or combined with theworking ro'tor winding, andto which cui-renewals i tor supplied withcurrent in this manner', while the brushes of the Asecondary winding areshort-circuited. Y

The drawing shows a motor arranged in accordance with this invention andis identical with Figure 8 of the former application referred to. Y

Let the primary and secondary windings (hereinafter called P and S) oanalternating current transformer, be arranged in the.

manner illustrated in the accompanying diagrammatic drawing, c'. e., asseparate bi-polar ring windings disposed in such a way that S canmoveindependently of P, while the points off-connection of the primarywinding to the source and the points between which the secondary windingis short-circuited, and

therefore the magnetic poles of P and S` are maintained on the line a:.r (constituting the working axis), which can be easily attained byproviding the winding S with a. segmental eo-inn'uilator andshort-circuiting the brushes situated on line a: w. lf no-w there beadded to the windings P and S a magnetizing winding (hereinafter calledM) so arranged that the current in it produces a magnetic field havingthe axis g/.y/ at right angles to the axis of the field of windings Pand` S, and if the current supplied to the winding M corresponds asnearly as possible in phase to the currents in l and S; then a torque isproduced which is proportional to the field of winding M, to the ampereturns of the rotor S, and to the cosine of the angle o'displacement otphase between these flast magnitudes. Upon rotation of the rotor in thefield having the :mis y y, z'. e., the field of winding M,;there isgenerated a counter-electromotive force which has its greatest effectivevalue on the Patented Sept. 16,1013.:

No. 111,1sc. Divided and this application inea sammy e",

line a'. a: andv is in phase with the magnetic l field having the axis yy, since it is generated by rotation in that field.

With increasing speed this counter-electroniotive force along the linefr; x due to rotation increases, and the rotor will con- 'tinue to speednp untill the counter-electrolnotive :torce plus the internal lossesequals the electroniotive Ytorce impressed upon the winding P. If thefield of winding M equals the eld of winding P the motor runssynchronously. All this is explained in the aforesaid originalapplication and it isthere also explained that the winding M may beseparate from the winding S and may have a separate commutator, or thewindings may be combined.

ln the example shown in the drawing, a potential is applied to thestator winding P at points on llne m a; from an outside. source, and,the' commutator has short-'circuited brushes lBland B2 on the line ofthe winding S. The magnct-izing winding M is' combined with the rotorwinding S and is suppliedv with current from outside through commutatorbrushes B3 and B'1 on the line g/ y, which is substantially 90electrical degrees displaced fromthe line Machines constructed inaccordance with the invention c an be used as generators, because uponexcitation through a determined magnetic field an electromotive forcemust in all cases arise at the rotating armature,

and this electromotive force, quite independently of the number ofrevolutions of the rotor, isequal in phase and periodicity with themagnetic eld.

The figure illustrates a bi-polar arrangement merely by way of example.For an apparatus having a greater number of poles the magnetic fieldaxes a: and y y are, generally stated, inclined to one another at ananlgle of 90 divided by half the number of po es.

The windings lon the stator are herein 4shown as ring windings but itmust be understood that all known and suitable open or closed windingscan be used. The windings on the rotor are also shown as ring windingsbut all suitable closed windings, such as areused for continuouscurrents and with segmental cmmutators, can be used.

What we claiml as new and desire to se- -cure by Let-ters Patent of theUnited States,

isi-

l. An alternating current machineV of the commutator type having brushescoperating to form for each pan' of primary poles, firstashort-circuitin'g path along approximately the'line of the primaryfield for theworking currentsA in the armature", and second, means forgenerating atall speeds a torque-producing field by feeding anappropriate magnetizing current from outside tothe armature.

2. An alternating current machine of the commutator vtype having brushesand connections therefor coperating to form for each pair of primarypoles, first a short-circuiting path along approximately the line of theprimary ield for the working currents in the armature, and second,-means for feeding a magnetizing currentfrom outside to the armature,the connections for feeding said magnetizing current being arranged tosupply at all speeds current substantially in phase with the workingcurrents.

3. An alternating current machine of the 4commutator type having twosystems of -brushes and connections therefor coperating to.form. foreach pair of primary poles first a short-circuiting path alongapproximately the line of the primary field for the working currents inthe armature, and sec-y ond, means for generating at all speeds atorque-producing field by feeding an appropriate magnetizing currentfrom outside to the armature.

4. An alternating current machine of the` commutator type having twosystems of -brushes and connections therefor coperating to form for eachpair of primary poles, Vfirst, a short-circuiting path alongapproximately the line of the primary field, for the working currents inthe armature, and second, means for feeding a magnetizing current fromoutside to the armature, the connections for feeding t-he said-magnetizing current beingV arranged to supply at all speeds currentsubstantially in phase with working currents. v

the? y l .n testlmony whereof, we afiix our signa-

